Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Bulged by axially contracting ends
Patent
1992-07-13
1993-12-21
Lindsey, Rodney M.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Bulged by axially contracting ends
411 55, 403277, 403282, F16B 1304
Patent
active
052717003
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a fixing member for being received in and fixed securely to a cylindrical hole in a wall of any kind, the member serving to fix, suspend, fasten, etc. an object of some kind.
More particularly, the invention relates to a fixing member comprising a tie bar having an expandable buffer mounted thereon, the buffer being surrounded by a split ring which is shorter than the length of said buffer, said expandable buffer bearing against an endpiece linked to one end of the tie bar, and a nut being screwed onto the opposite end of the tie bar to compress the expandable buffer axially, thereby causing both the buffer and the split ring to expand radially.
FIG. 5 of French patent No. 1 056 501 shows an anchor device of this type in which the tie bar is constituted by a bolt 19 whose head 20 serves as an abutment for the buffer 4. The buffer is surrounded by a split sleeve 5 having a plurality of slots, which slots naturally do not extend over the full length of the sleeve. The assembly is inserted into the cavity and the buffer 4 is compressed by a tapped rod 16 which serves as a nut and which is screwed onto the end of the shank of the bolt. The outside of the sleeve 5 is rough.
SUMMARY OF THE INVENTION
The present invention seeks to improve that type of fixing member so as to enable it to provide fixing which withstands a much higher extraction force.
Thus, the present invention provides a fixing member as defined above, and characterized by the fact that the inside surface of the split ring has a helical groove.
In has been observed that this technique is very important in obtaining an extraction force which is very high, and is much more important than having roughness on the outside surface of the ring.
According to another characteristic, the ring has a single slot extending over its entire length, thereby enabling the ring to expand uniformly over its entire length.
This slot is preferably made obliquely so that the absence of force is not localized on a generator line.
BRIEF DESCRIPTION OF THE DRAWING
Other characteristics of the invention appear from the following description of an embodiment of the invention made with reference to the accompanying drawing, in which:
FIG. 1 is a section through a fixing member of the invention;
FIG. 2 shows a part of the fixing member shown in FIG. 1;
FIG. 3 is an end view of the part shown in FIG. 2; and
FIG. 4 is a view on a larger scale showing a detail IV of FIG. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the example described, the fixing member is used to enable a load 3 which may be a maintenance machine, for example, to be suspended from a tube plate 1 fitted with tubes 2 in a water box of an apparatus such as a condenser, a reheater, a steam generator, etc.
The fixing member is thus intended to be fixed inside a tube 2. It comprises a tie bar 4 having an expandable buffer 5 fitted thereover. The buffer 5 is sandwiched between an endpiece 6 which is screwed onto the end of the tie bar and a sleeve 7 which is threaded over the other end of the tie bar. A thrust piece 8 is interposed between the sleeve 7 and the expandable buffer 5. In addition, in order to prevent the tie bar 4 from rotating, it includes a square 9 over which a square section bore 10 of the sleeve 7 is fitted.
A nut 11 is screwed onto the end of the tie bar over which the sleeve is disposed and it bears against the sleeve via a ball bearing abutment 12. The nut 11 is provided with a slot 13 to enable it to be screwed onto the tie bar 4 by means of a calibrated torque screwdriver.
Tightening the nut 11 thus moves the endpiece 6 and the sleeve 7 towards each other, thereby compressing the expandable buffer 5 axially and thus causing it to expand radially.
A split ring 14 is disposed around the expandable buffer 5. The length of the ring 14 is naturally shorter than the length of the expandable buffer 5 so as to allow the buffer to be compressed axially. The inside surface of the ring has a helical groove 17. As a result, while the
REFERENCES:
patent: 3053046 (1962-09-01), Fleming, Jr.
patent: 3093026 (1963-06-01), Mills et al.
patent: 3889820 (1975-06-01), Ranger
patent: 4020735 (1977-05-01), Herback
patent: 4108043 (1978-08-01), Varga
patent: 4797044 (1989-01-01), Velasco
ACB
Lindsey Rodney M.
LandOfFree
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